diff --git a/modules/services/x11/display-managers/kdm.nix b/modules/services/x11/display-managers/kdm.nix
index 8f7a5b5b3fe..e0a85f66f07 100644
--- a/modules/services/x11/display-managers/kdm.nix
+++ b/modules/services/x11/display-managers/kdm.nix
@@ -14,6 +14,9 @@ let
       [Shutdown]
       HaltCmd=${pkgs.upstart}/sbin/halt
       RebootCmd=${pkgs.upstart}/sbin/reboot
+      ${optionalString (config.boot.grubDevice != "") ''
+        BootManager=Grub
+      ''}
 
       [X-*-Core]
       Xrdb=${pkgs.xlibs.xrdb}/bin/xrdb
@@ -76,7 +79,7 @@ in
   config = mkIf cfg.enable {
   
     services.xserver.displayManager.job =
-      { execCmd = "${kdebase_workspace}/bin/kdm -config ${kdmrc}";
+      { execCmd = "PATH=${pkgs.grub}/sbin:$PATH ${kdebase_workspace}/bin/kdm -config ${kdmrc}";
         logsXsession = true;
       };
 
diff --git a/modules/services/x11/xserver.nix b/modules/services/x11/xserver.nix
index 63c7764f75d..cb71a484043 100644
--- a/modules/services/x11/xserver.nix
+++ b/modules/services/x11/xserver.nix
@@ -384,7 +384,7 @@ in
             rm -f /tmp/.X0-lock
           '';
 
-        exec = "${cfg.displayManager.job.execCmd}";
+        script = "${cfg.displayManager.job.execCmd}";
       };
 
     services.xserver.displayManager.xserverArgs =